<?php
/**
 * drop-processor.php
 *
 * This file implements the processor for the DROP statements.
 *
 * Copyright (c) 2010-2012, Justin Swanhart
 * with contributions by André Rothe <arothe@phosco.info, phosco@gmx.de>
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
if (!defined('HAVE_DROP_PROCESSOR')) {

    require_once(dirname(__FILE__) . '/../expression-token.php');
    require_once(dirname(__FILE__) . '/../expression-types.php');
    require_once(dirname(__FILE__) . '/abstract-processor.php');

    /**
     * 
     * This class processes the DROP statements.
     * 
     * @author arothe
     * 
     */
    class DropProcessor extends AbstractProcessor {

        public function process($tokenList) {
            $skip = false;
            $warning = true;
            $base_expr = "";
            $expr_type = false;
            $option = false;
            $resultList = array();

            foreach ($tokenList as $k => $v) {
                $token = new ExpressionToken($k, $v);

                if ($token->isWhitespaceToken()) {
                    continue;
                }

                if ($skip === true) {
                    $skip = false;
                    continue;
                }

                switch ($token->getUpper()) {
                case 'VIEW':
                case 'SCHEMA':
                case 'DATABASE':
                case 'TABLE':
                    $expr_type = strtolower($token->getTrim());
                    break;

                case 'IF':
                    $warning = false;
                    $skip = true;
                    break;

                case 'TEMPORARY':
                    $expr_type = ExpressionType::TEMPORARY_TABLE;
                    $skip = true;
                    break;

                case 'RESTRICT':
                case 'CASCADE':
                    $option = $token->getUpper();
                    break;

                case ',':
                    $resultList[] = array('expr_type' => $expr_type, 'base_expr' => $base_expr);
                    $base_expr = "";
                    break;

                default:
                    $base_expr .= $token->getToken();
                }
            }

            if ($base_expr !== "") {
                $resultList[] = array('expr_type' => $expr_type, 'base_expr' => $base_expr);
            }

            return array('option' => $option, 'warning' => $warning, 'object_list' => $resultList);
        }
    }
    define('HAVE_DROP_PROCESSOR', 1);
}
